How old is this book and they are just now catching it?
Check it out:

A social studies workbook, used in an Illinois public middle school, is generating controversy among gun rights supporters because it claims that the Second Amendment permits only strictly regulated, registered gun ownership.

A screenshot of the workbook was first posted to the Facebook page for Illinois Gun Owners Rights. It provides the following description of the Second Amendment:

This amendment states that people have the right to certain weapons, providing that they register them and have not been in prison. The founding fathers included the amendment to prevent the United States from acting like the British who had tried to take weapons away from the colonists.

The actual text of the Second Amendment makes no mention of gun registration: